The undisplay command cancels expressions to be displayed when the program execution stops.


undisplay itemnum
  1. itemnum is the number of the expressions for which the display is canceled.


When the display command is used, each expression displayed is assigned an item number.

The undisplay command allows you to remove expressions from the list to be displayed, using the item number to specify the expression to be removed.


(fgldb) step 
2: i = 2 
1: a = 20 
9     FOR  i = 1 TO 10
(fgldb) undisplay 2
(fgldb) step 
1: a = 20 
10   LET cont = TRUE